解决问题：AttributeError: ‘_io.BufferedWriter‘ object has no attribute ‘wirte‘

```python
import urllib.request

response = urllib.request.urlopen("http://placekitten.com/g/500/600")
cat_img = response.read()

with open("cat_500_600.jpg","wb") as f:
    f.wirte(cat_img)

是我太憨憨了，居然吧write写成wirte了

import urllib.request

response = urllib.request.urlopen("http://placekitten.com/g/500/600")
cat_img = response.read()

with open("cat_500_600.jpg","wb") as f:
    f.write(cat_img)